Shuttleless weaving looms



Dec. 4, 1956 R. DEWAS SHUTTLELESS WEAVING LOOMS Filed Aug. 4. 1953 llllIl "Ill! ATTO RN EMS United States Patent 2,772,697 SHUTTLELESS WEAVING LooMs' Raymond Dewas, Amiens, France Application August 4, 1953, Serial No. 372,283 Claims priority, application Great August 6, 1952 6 Claims. (Cl. 139-35) The invention relates to improvements in shuttleless weaving looms and has for one of its objects to facilitate the formation of the selvedges.

When, on certain of these looms, the healds which form the successive sheds cross before the reed heats up the weft thread, the selvedge warp threads may influence the one and/or the other end of the weft thread which has just passed across the shed, thus tending to complicate the formation of the selvedges that may or may not comprise crossing threads or the like.

Another object of this invention is to prevent the selvedge threads from exercising undesirable stresses on one and/or the other end of the inserted pick or weft thread.

The invention consists in a shuttleless weaving loom and is characterized in that the crossing of the selvedge warp threads in the part between the fell of the cloth and the reed is temporarily restrained until the moment when the reed presses the weft thread, which has just passed, against the fell of the cloth.

Clearly, when the end of the weft thread is held closely at the fell of the cloth, it is best able to withstand the stress due to the crossing of the warp threads and/or of the leno or crossing threads or the like.

In the present invention this result is achieved by means of a rod, which is introduced into the shed, preferably behind the reed, during the passage of the 'weft thread,

the said rod leaving the shed whilst the weft thread is being beaten up by the reed, said rod being prefer-ably mounted on the slay. i

The rod or rods for the one and/ or the other selvedge, thus utilized temporarily to keep back the apex of the angle made by the warp threads of the divided upper and lower sheds or sheets at the fore part of the new or next shed whilst it is being formed, may be actuated by any appropriate means.

The rod may be cylindrical and of small diameter, or it can be constituted by a thin rectilinear slat; the rod or the slat in some cases being slightly undulated.

These features, as well as others not yet indicated, will be disclosed in more detail in the following description of one way of carrying the invention into effect when applied to a needle weaving loom, this description being given only by way of example, that is not limitative and which is presented in diagram form in the attached drawing in which:

Figure 1 is a plan of the right side of the loom;

Figure 2 is a side elevation of Figure 1;

Figure 3 and Figure 4 show details of the operation of the restraining means;

Figure 5 is a side elevation of the sheets of warp threads at the moment when the weft thread has just been passed through the shed; and

Figure 6 is a view similar to Figure 5, at a moment when the weft thread is brought towards the fell by the reed.

In the drawings, 1 is one of the swords on which is mounted the slay 2 carrying the conduit 3 in which slides the needle 4 (represented without its head in the drawing to avoid confusion); 5 is the reed and 6 and 7 are the sheets of warp thread forming the shed; 8 represents the weft thread and 9 indicates the fell.

The restraining means according to this invention is carried on the sword 1 by means of a bracket 10 secured in place by a bolt 11 and supports a shaft 12 having a rocker 13 pivoted thereon, the rocker 13 being constituted by two juxtaposed metal sheets, each of which has three arms 14, 15 and 16.

The arm 14 of the rocker 13 has two projections 17 and 18 which can come into contact with fixed stops 19 and 20 respectively, towards the end of the to and fro passage of the slay, thus causing the rocker 13 to turn firstly to the position shown in full lines (Figures l and 3) and then to the position shown in chain lines (Figures 1 and 4).

The bracket 10 has the projection 21 mounted thereon, the projection 21 having one of its ends 21a bent over into U-form to act as a bearing for the shaft 22 carrying the rod 23, the free end of which can slide through the I by the stops 19 and 20, the limit of movement of the rocker 13 being defined by the notch 27 in the angle piece 28 attached to the projection 21.

The arm 16 of the rocker 13 has the gudgeon 29 mounted in the end thereof, the gudgeon 29 co-operating with the fork 30 forming part of the rod 31. The rod 31 slides in the two bearings 32 attached to the conduit 3, with the operative end of the rod turned towards the warp threads moving behind the reed 5.

The restraining means function as follows:

Towards the end of the backward run of the slay 2, the projection 17 contacts with the stop 19, thus causing the rocker 13 to be turned and the rod 31 to enter between the sheets 6 and 7 of the warp thread behind the reed 5, When the longitudinal axis of the rod 23 is deflected past the line x-x passing through the centres of the shafts 12 and 22, the spring 26 rapidly completes the turning of the rocker 13 which moves the rod 31 and said spring maintains the rod 31 fully entered between the warp sheets.

The slay 2 then returns to its forward position, and Figure 1 shows the relation of the part at the moment when the introduction of a weft thread 8 by the needle 4 has just been completed. The sheets 6 and '7 then simultaneously close up, as shown in Figure 5, then cross to form a new shed, as shown in Figure 6; the crossing of the warp threads at the selvedges 6 and 7 in the part between the 'fell 9 and the reed 5 is however temporarily prevented by the presence of the said rod.

Towards the end of the forward run, of the slay 2, the projection 18 comes into contact with the stop 20 and owing to the fact that the projection 18 is situated very close to the shaft 12 of the rocker 13 and that the longitudinal axis of the rod 23 again passes the line xx as at the beginning of the turning movement of the rocker 13, the small impulse given by the stop 20 to the projection 13 is sufficient to cause the rocker 13 to turn rapidly and completely, due to the sharp releasing action of the spring 26, into the position shown in chain lines in Figures 1 and 4, thus causing the rod 31 to leave the selvedge of the cloth, as shown in chain lines in Figure l-. The impulse which starts the turning of the rocker 13 may be very slight, so that it is possible to impart it at the last moment just before the reed 5 arrives at the fell 9.

It will be clear that as the end of the weft thread 8 is held at the fell of the cloth it is best able to withstand the stress due to the crossing of the warp threads or/ and of the leno or crossing threads or the like.

It is to be understood that variants, improvements of detail and the use of equivalent means can be introduced Without departing from the scope of the invention.

The rod or/and its mounting can be arranged or constructed in such a manner that it will yield to allow the rod to find its equilibrium between the opposing stresses in the upper and lower divided warp sheets whilst opening, as shown for example in Figure 6. In some cases the elasticity of the rod itself may be sufiicient or/ and some slackness may be allowed in the front bearing 32, possibly with springs to return the rod to a proper position and so that it can penetrate into the shed.

The depth of penetration of the rod or rods into the interior of the shed may be more or less according to the requirements of the weaving.

The rod, instead of entering into the shed by the side, might be re-arranged to enter the shed across one of the sheets of Warp threads towards the selvedge threads.

In the case of a multiple shed, there may be one rod in each shed.

instead of introducing a rod into the interior of the shed, the selvedge threads may, approximately at the moment when the healds coincide, be tightened from the outside by means of a notched metal sheet. The operation may also be performed by separate parts situated respectively above and below the divided warp sheets of the shed.

What is claimed is:

1. Means for controlling the warp threads in selvedges produced in a shuttleless weaving loom, comprising two stationary stops, an element mounted on the slay of the loom to slide into the shed and a spring urged toggle mechanism mounted on the slay and having projections that contact with said stationary stops as the slay moves to and fro initially to move the element positively until the toggle mechanism passes the point of unstable equilibrium when the full travel of the element is rapidly completed by the spring.

2. Means for controlling the warp threads in the selvedges produced in a shuttleless weaving loom comprising an element mounted to slide on the slay of the loom across each shed. a rocker pivoted on the slay of the loom adjacent each element, a first arm on the rocker co-operating with the element to slide the element into and out of the shed, a second arm on the rocker, a first projection on the second arm, a stationary stop to cooperate with the first projection during travelof the second arm in one direction, a second projection on the second arm, a stationary stop to co-operate with the second projection during travel of the second arm in the reverse direction, a third arm on the rocker, a guide pivoted in the third arm, a projection on the slay, a rod pivoted on the projection and sliding freely in the guide and a compression spring coiled about the rod to urge the rocker to slide the element rapidly across the selvedge warp threads of the shed behind the reed of the loom during the introduction of the weft thread and rapidly out of the shed when the weft thread is to be beaten up.

3. Means for controlling the warp threads in the selvedges produced in a shuttleless weaving loom according to claim 3, characterized in that the element is springy.

4. Means for controlling the warp threads in the selvedges produced in a shuttleless weaving loom according to claim 3, characterized in that the element is yielding'ly mounted on the slay of the loom.

5. A device for controlling the warp threads in the selvedges produced in a shuttleless loom, comprising an element positioned near the reed and adapted to be moved into and out of the shed opposite the selvedge, means for moving said element into the shed before the warp threads are crossed, means maintaining said element in the shed up to the moment when the reed is pressing the weft thread against the fell of the cloth, and means thereafter moving said element out of the shed.

6. A device for controlling the warp threads in the selvedges produced in a shuttleless loom, comprising restraining means positioned near the reed and adapted alternately to engage and release the warp threads of the selvedges so as to temporarily restrain said warp threads from being crossed, means maintaining said restraining means in said restraining engagement with said warp threads up to the moment when the reed is pressing the weft threads against the fell of the cloth, and means thereafter moving said restraining means out of engagement with said warp threads.

References Cited in the tile of this patent UNITED STATES PATENTS 671,534 Bartlett Apr. 9, 1901 2,152,592 Hardiman .Mar. 28, 1939 2,441,802 Dewas May 18, 1948 FOREIGN PATENTS 977,340 France Nov. 8, 1950 

